/Engine/Plugins/Experimental/Mutable/Source/MutableRuntime/Public/MuR/MeshBufferSet.h
Find the index of a buffer channel by semantic and relative index inside the semantic.
void FindChannel ( [MESH_BUFFER_SEMANTIC](API\Plugins\MutableRuntime\MuR\mu__MESH_BUFFER_SEMANTIC) semantic, int semanticIndex, int * pBuffer, int * pChannel ) const